Geological Society. 265 



vertebral scutes ; and the concentric ornamentation left on the 

 carapace and plastron by all the scutes. The author proposed for the 

 species the name of Emijs liordwdlcnsh. 



" On an associated Series of cervical and dorsal Vertebrae of 

 Polyptychodon from the Cambridge Upper Greensand." By Harry 

 Govier Seeley, Esq., F.L.S., F.G.S. 



The author remarked upon the rarity of vertebrse of PohiptycJiodon 

 in the Cambridge Greensand in comparison with the abundance of 

 teeth, and stated that those collected do not appear to be the re- 

 mains of more than two individuals, probably representing two 

 species. One series from Haslingfield was described and figured by 

 Prof. Owen in 1860 ; the other, somewhat smaller series, described 

 in the present paper, is from the Huntingdon Road. The author de- 

 scribed in detail the structure of the atlas and axis and of the five 

 succeeding (cervical) vertebroe ; nine dorsal vertebrae were also 

 described. 



" On Crocod'das icenicus (Seeley), a second and larger species of 

 Crocodile from the Cambridge Upper Greensand." By Harry Govier 

 Seeley, Esq., E.L.S., E.G.S. 



In this paper the author described a cervical and a dorsal ver- 

 tebra of a new species of Crocodile. The former is probably the last 

 cervical. It is 2\ inches long, and differs from that of existing 

 Crocodiles in the large size of the parapophyses, the distinct anterior 

 notch in the neural arch for the vertebral nerve, and the perfect 

 convexity of the articular ball. The dorsal vertebra is the sixth or 

 seventh ; it measures 2| inches in length, and shows a depression 

 and perfect convexity of the articular ball, which distinguish it 

 from existing species. The animal was probably about 16 ft. long. 



" On Macrurosaurus semmis (Seeley), a long-tailed animal with 

 proccelous vertebrae, from the Cambridge Upper Greensand." By 

 Harry Govier Seeley, Esq., F.L.S,, E.G.S. 



The author described a series of about 40 associated and nearly 

 successive caudal vertebrEe obtained from one of the deeper phospha- 

 tite workings on Coldham Common. The tail, when complete, pro- 

 bably included 50 vertebrae, and measured 15 feet in length. The 

 articulations of the earlier vertebras are proccelous ; then they become 

 nearly flat, then biconcave, and towards the end of the tail irregular. 

 There are no chevron boues. The neural arch in the earlier part of 

 the tail was supported on pedicles rising from the centrum, de- 

 pressed and devoid of neural spine. The neural arches were of great 

 antero-posterior extent and compressed. The author remarked that 

 although the tail as a whole is more in accordance with the Lacer- 

 tian type than with any other order of true reptiles, the combination 

 of the proccelous character with the absence of chevron bones isi 



An7\. & May. N. Hist. Ser. 4. Vol. xix. 18 



